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Complete Noob in need of advice.
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Farmz246 View Drop Down
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Joined: 25 September 2025
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    Posted: 25 September 2025 at 4:00pm
Hi all,
I have an antique cable radio speaker box which I would like to make into a bluetooth speaker.
The existing speaker and internals are useless, so basically it's just a wooden box.
The old speaker was 8" round and about 4" deep.
I was looking to use the following to make it into a bluetooth speaker.

Dayton Audio KAB-250v4 2 x 50W Class D Audio Amplifier Board with Bluetooth 5.0

Dayton Audio KAB-FC Function Cables Package for Bluetooth Amplifier Boards

19.5V DC 3.33A AC Power Supply Adapter with 2.1 x 5.5mm Tip + Plug

Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm

I was thinking of using 2 of the 4" drivers, instead of an 8" Full Range driver, to save on weight, as this unit will be hung on a wall.

Would I need to add anything else, like a crossover board?

HELP!
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GEB View Drop Down
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Joined: 13 November 2009
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Points: 2052 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GEB Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2025 at 4:43pm
If it's a full range driver it will require no crossover with that amplifier.
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Farmz246 View Drop Down
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Originally posted by GEB GEB wrote:

If it's a full range driver it will require no crossover with that amplifier.

Even if I am using two of the same driver?
Sorry for questioning but don't want to make any mistakes.

Is there anything else that you would suggest is needed?
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Farmz246 View Drop Down
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and if I decide to use a woofer along with the full range driver, would I then need a crossover?
If so what would you suggest?

Is there any point to having a woofer along with the full range, or not really needed?
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Points: 2052 		Post Options Post Options   Thanks (1) Thanks(1)   Quote GEB Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2025 at 6:17pm
Just run 1 full range driver per amplifier channel. If you intend to go with a sub too I'd recommend a 2.1 amplifier with crossover built in already. Keeps things simple on your part.

A 2.1 amplifier will run 1 sub + 2 full range drivers (stereo + sub). The sub driver would ideally need it's own separate chamber inside the box though.


Edited by GEB - 25 September 2025 at 6:19pm
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Farmz246 View Drop Down
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Ok.
How do I connect the 

19.5V DC 3.33A AC Power Supply Adapter with 2.1 x 5.5mm Tip + Plug to the amplifier card?
https://www.parts-express.com/19.5V-DC-3.33A-AC-Power-Supply-Adapter-with-2.1-x-5.5mm-Tip-Plug-120-195?quantity=1 - https://www.parts-express.com/19.5V-DC-3.33A-AC-Power-Supply-Adapter-with-2.1-x-5.5mm-Tip-Plug-120-195?quantity=1

https://www.parts-express.com/Dayton-Audio-KAB-250v4-2-x-50W--D-Audio-Amplifier-Board-with-Bluetooth-5.0-325-505?quantity=1 - https://www.parts-express.com/Dayton-Audio-KAB-250v4-2-x-50W-Class-D-Audio-Amplifier-Board-with-Bluetooth-5.0-325-505?quantity=1


Edited by Farmz246 - 25 September 2025 at 7:17pm
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Normally it just plugs straight into the board via a barrel connector. If your amp has bare wire power inputs then just chop the barrel connector off the amp and wire it in via bare wires.
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Originally posted by Farmz246 Farmz246 wrote:

Hi all,
I have an antique cable radio speaker box which I would like to make into a bluetooth speaker.
The existing speaker and internals are useless, so basically it's just a wooden box.
The old speaker was 8" round and about 4" deep.
I was looking to use the following to make it into a bluetooth speaker.

Dayton Audio KAB-250v4 2 x 50W Class D Audio Amplifier Board with Bluetooth 5.0

Dayton Audio KAB-FC Function Cables Package for Bluetooth Amplifier Boards

19.5V DC 3.33A AC Power Supply Adapter with 2.1 x 5.5mm Tip + Plug

Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm

I was thinking of using 2 of the 4" drivers, instead of an 8" Full Range driver, to save on weight, as this unit will be hung on a wall.

Would I need to add anything else, like a crossover board?

HELP!

Erm .. How do 2 x 4" drivers fit in an 8" hole.. Methinks an 8" dual concentric would be a more appropriate..


 https://www.bcspeakers.com/en/products/coaxial/8/8/8CX21
DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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Farmz246 View Drop Down
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Joined: 25 September 2025
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Thanks for the suggestion.
The hole is actually 9", so I was thinking of attaching the two 4" on two strips of wood, top and bottom, then attach the strips across the hole.
Can't figure out how to share a picture of it that I have on my google photos.
I looked at the link for the 8" dual concentric but that weighs 9lbs, which I think is too much for the purpose.
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Points: 2052 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GEB Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2025 at 2:02pm
Ok I'm out 🤣. This has to be a wind up!
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Farmz246 View Drop Down
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Not a wind up.
Just someone who knows next to nothing about speakers.
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Points: 2052 		Post Options Post Options   Thanks (0) Thanks(0)   Quote GEB Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2025 at 2:15pm
Mounting them on 2 bits of wood won't work unless they're sealed to the box (air tight all the way around the driver circumstance).
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